﻿using System;

class SignOfAProduct
{
    static void Main()
    {
        int firstNumber;
        int secondNumber;
        int thirdNumber;

        Console.WriteLine("Type first number:");
        bool isFirstNumberValid = int.TryParse(Console.ReadLine(), out firstNumber);
        Console.WriteLine("Type second number:");
        bool isSecondNumberValid = int.TryParse(Console.ReadLine(), out secondNumber);
        Console.WriteLine("Type third number:");
        bool isThirdNumberValid = int.TryParse(Console.ReadLine(), out thirdNumber);

        if (isFirstNumberValid && isSecondNumberValid && isThirdNumberValid)
        {
            int counter = 0;
            if (firstNumber < 0)
            {
                counter++;
            }
            if (secondNumber < 0)
            {
                counter++;
            }
            if (thirdNumber < 0)
            {
                counter++;
            }
            if (firstNumber == 0 || secondNumber == 0 || thirdNumber == 0)
            {
                counter = -1;
            }
            if (counter % 2 == 0)
            {
                Console.WriteLine("The product is positive");
            }
            else if (counter ==-1)
            {
                Console.WriteLine("The product is zero");
            }
            else
            {
                Console.WriteLine("The product is negative");
            }
        }
        else
        {
            Console.WriteLine("Your input isn`t OK!!!");
        }
    }
}